明あかるむ

godan verb (-mu), intransitive verb

brighten; grow light

Describes the sky or surroundings becoming lighter, typically at dawn. Intransitive.

• 東ひがしの空そらが明あかるんできた。

  The eastern sky has begun to brighten.

• 夜よが明あけて、外そとが明あかるむ。

  Dawn breaks and it grows light outside.